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Asked: 2026-06-15T05:06:13+00:00

I’ve Win32 DLL application. Debug build is selected. I wrote such code: #if DEBUG

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I’ve Win32 DLL application. Debug build is selected. I wrote such code:

#if DEBUG
fflush(logFile);
#endif

But fflush(logFile); is grayed out so I assume it will not be executed.
But i want it to be executed. Does it mean that in Debug DEBUG symbol is not defined? Where can I define it in VS2012?

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1 Answer

  1. Editorial Team

    Preprocessor definitions are defined under project settings as shown on screenshot (note _DEBUG there):

    enter image description here

    Note that in case of _DEBUG you want to check if it is defined at all, and not compare it (possibly missing definition) to zero. You want:

    #if defined(_DEBUG)

    or

    #ifdef _DEBUG

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